We first introduce a delivery scheme with the same placement as [1]} working for \({\mathsf {M}}=t\frac{{\mathsf {N}}}{{\mathsf {K}}}\)  with \(t\in [0:{\mathsf {K}}]\) . For each \(\mathcal {J}\subseteq [{\mathsf {K}}]\)  where \(|\mathcal {J}|=t+1\) , define \(\mathcal {R}_{\mathcal {J}}=\lbrace i\in [{\mathsf {H}}]:\mathcal {J}\subseteq \mathcal {U}_{i}\rbrace \)  as the set of relays connected to all the users in \(\mathcal {J}\) , e.g., for the network in Fig. REF , \(\mathcal {R}_{\lbrace 1,2\rbrace }=\lbrace 1\rbrace \) , \(\mathcal {R}_{\lbrace 1,2,3\rbrace }=\lbrace 1\rbrace \) .
